N4 Session Management
N4 session management procedures are used to control the functionality of the UPF. SMF can create, update, and remove the N4 session context in the UPF, which is described in 3GPP TS 23.501, clause 5.8.2.
The following procedures are performed in N4 Session Management:
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N4 Session Establishment
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N4 Session Modification
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N4 Session Deletion
NOTE: The SMF initiates all the above procedures.